CN111666669A - Method for determining water replenishing rate of circulating water cooling system through concentration ratio - Google Patents

Abstract

The invention discloses a method for determining the water replenishment rate of a circulating water cooling system through a concentration ratio, which can objectively and truly reflect the operating parameters of the circulating water system, adjust and check the problems existing in the operation in time, so as to accurately control the water replenishment rate of the system and reduce the The new water consumption of the system can achieve the effect of energy saving and emission reduction.

Description

A method for determining the water replenishment rate of circulating water cooling system by concentration ratio

technical field

The invention belongs to the field of environmental engineering, and particularly relates to a method for determining the water replenishment rate of a circulating water cooling system through a concentration ratio.

Background technique

Taking iron and steel enterprises as an example, the circulating water cooling system has a wide range of uses and is essential for the production of enterprises. Most of the operation modes are that the water after heat exchange with the equipment is transported into the tower by the lift pump, and then the heat exchange, or heat and mass exchange between the water and the air is carried out to achieve the purpose of lowering the water temperature.

The water management level of the water system in foreign developed countries is relatively high. Generally, the recycling and reuse of water are considered as much as possible, and the use of non-traditional water resources as supplementary water sources is considered to reduce the amount of new water and the amount of wastewater discharged. Although the current domestic environmental protection policies are becoming more and more strict, and enterprises are paying more and more attention to the management of water resources, the relationship between the concentration rate and the water replenishment rate of the circulatory system has not been quantitatively described by mathematical model theory.

SUMMARY OF THE INVENTION

In view of the deficiencies in the prior art, the present invention provides a method for determining the water replenishment rate of a circulating water cooling system through a concentration ratio, which can objectively and truly reflect the operating parameters of the circulating water system, adjust and check the problems in operation in time, so as to accurately Control the water replenishment rate of the system, reduce the new water consumption of the system, and achieve the effect of energy saving and emission reduction.

In order to achieve the above object, the present invention adopts the following technical solutions to realize:

A method for determining the water replenishment rate of a circulating water cooling system by a concentration ratio, characterized in that: the circulating water cooling system is an open circulating water cooling system, including all pipeline valves, a cooling tower system and a production process heat exchange system, and in a stable state;

The only water replenishment rate entering the circulating water cooling system is F ₀ , and the discharge water rate of the circulating water cooling system includes F ₁ and F ₂ , where F ₁ is the discharge water rate that carries salts and F ₂ is only discharged in the form of water molecules water discharge rate;

The concentration of each ion in the circulating water cooling system is C ₁₁ , C ₁₂ , C ₁₃ · · · · · · · · · · · · · · C _{1 (n-1)} , C _1n , and C ₁₁ <C ₁₂ <C ₁₃ · · · · · · · · C _{1 (n- 1)} <C _1n , the corresponding ion concentrations in the supplementary water are C ₀₁ , C ₀₂ , C ₀₃ ··· C _0(n-1) , C _0n , the concentration ratio of the circulating water cooling system N=(C ₁₁ +C ₁₂ +C ₁₃ +・・・+C _1(n-1) +C _1n )/(C ₀₁ +C ₀₂ +C ₀₃ +・・・+C _0(n-1) +C _0n ) , n takes 3-5;

The ions in the circulating water cooling system include but are not limited to sodium ion, potassium ion, chloride ion, fluoride ion, calcium ion, magnesium ion, sulfate ion, nitrate ion, silicon ion, iron ion and aluminum ion. The concentration does not change within 24h under the condition of normal pressure illumination, and the ion is not contained in the introduction of the surrounding environment and the system dosing;

Described F ₀ is only artificial water replenishment, ignoring the influence of natural conditions, including but not limited to rain, snow and hail;

The F ₁ contains the same concentration of salts as the circulating water cooling system, which is limited to the blowdown of the circulating water cooling system. The leakage rate of the circulating water cooling system is zero, ignoring but not limited to drifting, splashing, running and dripping. the effect of the phenomenon;

The F ₂ is discharged into the environment in the form of water molecules, including but not limited to the evaporation of water surface and the evaporation of water on the surface of objects, which is a constant under natural conditions;

According to the water balance: F ₀ =F ₁ +F ₂ ;

According to the water quality salt balance: F ₀ =F ₁ ·N

Therefore, F ₀ =N·F ₂ /(N-1).

The value of F ₂ is 0.01-0.02.

The beneficial effect of the invention is that the concentration ratio value of the circulation system can be obtained objectively and truly, so as to accurately control the water replenishment rate of the system, reduce the fresh water consumption of the system, and realize the effect of energy saving and emission reduction.

Detailed ways

Described below in conjunction with specific embodiments:

Example 1:

A long-term stable operation of an open circulating water cooling system, the actual measured water replenishment rate is 0.02, the constant of F ₂ is 0.01, the potassium ion concentration in the circulating system is 11.2mg/L, the magnesium ion is 23.8mg/L, and the chlorine ion is 23.8mg/L. The ion is 42.1mg/L; the potassium ion concentration in the replenishment water is 3.8mg/L, the magnesium ion is 8.2mg/L, and the chloride ion is 14.1mg/L.

So N=(11.2+23.8+42.1)/(3.8+8.2+14.1)=2.95,

The system water replenishment rate F ₀ =2.95×0.01/(2.95-1)=0.015.

Since the real water replenishment rate of the system calculated by the model is smaller than the actual measured water replenishment rate, it is determined that the system has a high water replenishment rate. By checking the problems existing in the operation of the system, the actual water replenishment rate can be reduced, and the consumption of new water can be reduced.

Example 2:

A long-term stable operation of an open circulating water cooling system, the actual measured water replenishment rate is 0.026, the constant of F ₂ is 0.015, the silicon ion concentration in the circulating system is 1.3mg/L, potassium ion is 17.9mg/L, magnesium ion is 17.9mg/L, magnesium The ion is 21.5mg/L; the silicon ion concentration in the replenishment water is 0.24mg/L, the potassium ion is 3.2mg/L, and the magnesium ion is 5.1mg/L.

So N=(1.3+17.9+21.5)/(0.24+3.2+5.1)=4.77,

The system water replenishment rate F ₀ =4.77×0.015/(4.77-1)=0.019.

Since the real water replenishment rate of the system calculated by the model is smaller than the actual measured water replenishment rate, it is determined that the system has a high water replenishment rate. By checking the problems existing in the operation of the system, the actual water replenishment rate can be reduced, and the consumption of new water can be reduced.

Example 3:

A long-term stable operation of an open circulating water cooling system, the actual measured water replenishment rate is 0.032, the constant of F ₂ is 0.02, the concentration of silicon ions in the circulating system is 2.4mg/L, potassium ions are 15.1mg/L, calcium ions are 15.1mg/L, calcium The ion is 48.6mg/L; the silicon ion concentration in the replenishment water is 1.54mg/L, the potassium ion is 3.4mg/L, and the calcium ion is 13.6mg/L.

So N=(2.4+15.1+48.6)/(1.54+3.4+13.6)=3.57,

The system water replenishment rate F ₀ =3.57×0.02/(3.57-1)=0.028.

Since the real water replenishment rate of the system calculated by the model is smaller than the actual measured water replenishment rate, it is determined that the system has a high water replenishment rate. By checking the problems existing in the operation of the system, the actual water replenishment rate can be reduced, and the consumption of new water can be reduced.

Claims (2)

1. A method for determining the water replenishing rate of a circulating water cooling system through concentration ratio is characterized by comprising the following steps: the circulating water cooling system is an open circulating water cooling system, comprises all pipeline valves, a cooling tower system and a production process heat exchange system and is in a stable operation state;

the only water replenishing rate entering the circulating water cooling system is F₀The discharge water rate of the circulating water cooling system comprises F₁And F₂In which F is₁Is the rate of discharge of the salt-carrying substances, F₂The water discharge rate is the water discharge rate discharged only in the form of water molecules;

the concentration of each ion in the circulating water cooling system is C₁₁，C₁₂，C₁₃····C_1(n-1)，C_1nAnd C is₁₁＜C₁₂＜C₁₃····C_1(n-1)＜C_1nThe concentration of each ion in the corresponding water supplement is C₀₁，C₀₂，C₀₃····C_0(n-1)，C_0nConcentration multiplying factor N ═ C of circulating water cooling system₁₁+C₁₂+C₁₃+····+C_1(n-1)+C_1n)/(C₀₁+C₀₂+C₀₃+····+C_0(n-1)+C_0n) N is 3-5;

ions in the circulating water cooling system include but are not limited to sodium ions, potassium ions, chloride ions, fluoride ions, calcium ions, magnesium ions, sulfate ions, nitrate ions, silicon ions, iron ions and aluminum ions, the concentration of the ions does not change within 24 hours under the condition of normal temperature and normal pressure illumination, and the ions are not contained in the agent brought into the surrounding environment and added into the system;

said F₀Only supplementing water for manual work, neglecting the influence of natural conditions, including but not limited to rain, snow and hail;

said F₁The salt substances with the same concentration as the circulating water cooling system are contained in the circulating water cooling system, the pollution discharge of the circulating water cooling system is limited, the leakage rate of the circulating water cooling system is zero, and the influence of phenomena such as drifting, splashing and leakage is ignored and not limited;

said F₂The water is discharged into the environment in the form of water molecules, including but not limited to evaporation on the water surface and evaporation of water on the object surface, and is a constant under natural conditions;

according to water balance: f₀＝F₁+F₂；

According to the balance of water quality salt substances: f₀＝F₁·N

Thus, F₀＝N·F₂/(N-1)。

2. The method for determining the water replenishing rate of the circulating water cooling system through the concentration rate as claimed in claim 1, wherein: said F₂The value is 0.01-0.02.